Also expected to endorse Gillibrand, according to one of her aides, are representatives Nita Lowey of Westchester and Brian Higgins of Buffalo.

But it's going to be interesting, as some of the delegation starts to fall in behind Gillibrand, to watch who the holdouts are.

After all, this thing isn't totally settled, even among New York's Democratic House members. Carolyn Maloney insists she is still considering a Senate bid, and Carolyn McCarthy said in a recent interview that she still feels someone—anyone—needs to challenge Gillibrand. And it’s not just Gillibrand’s policies that McCarthy said she finds objectionable: “It’s not just the issues, it’s the personality.”

The roll-out of endorsements today comes the same day that Liz Benjamin quoted an unnamed White House source saying, "We won't do anything else until she produces endorsements from her delegation," and, "[Obama] is sensitive to the fact that none of her colleagues like her."